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Full-Text Articles in Engineering
The Impacts Of Supply Disruptions And Dynamic Pricing On A Continuous-Review Inventory System With Price-Sensitive Customer Demands, Yuerong Chen, Shengyong Wang
The Impacts Of Supply Disruptions And Dynamic Pricing On A Continuous-Review Inventory System With Price-Sensitive Customer Demands, Yuerong Chen, Shengyong Wang
Dr. Shengyong Wang
No abstract provided.
Improving Kaizen Event Success In Healthcare Through Shorter Event Duration, James Natale, Ravi Uppal, Shengyong Wang
Improving Kaizen Event Success In Healthcare Through Shorter Event Duration, James Natale, Ravi Uppal, Shengyong Wang
Dr. Shengyong Wang
A common method of applying Lean principles within healthcare organisations for process improvement is the 'Kaizen Event'. These events often engage a team of 5–8 team members, and span 3–5 days. As the investment in time, energy and financially is large, it is crucial that the event be used to greatest benefit. While the Kaizen Event was crafted for use in the manufacturing sector, there are a number of difficulties when applied in the healthcare sector. In this research, we studied three differing event styles: a traditional three–and–a–half–day event, a two–and–a–half–day event, and a three–half–day event. While the event structures …
Intelligent Identification Of Childhood Musical Murmurs, Yuerong Chen, Shengyong Wang, Chia-Hsuan Shen, Fred Choy
Intelligent Identification Of Childhood Musical Murmurs, Yuerong Chen, Shengyong Wang, Chia-Hsuan Shen, Fred Choy
Dr. Shengyong Wang
Heart murmurs are often the first signs of heart valvular disorders. However, most heart murmurs detected in children are innocent musical murmurs (also called Still's murmurs), which should be distinguished from other murmur types that are mostly pathological, such as regurgitant, obstructive, and flow murmurs. In order to reduce both unnecessary healthcare expenditures and parental anxiety, this study aims to develop algorithms for intelligently identifying musical murmurs in children. Discrete wavelet transform was applied to phonocardiographic signals to extract features. Singular value decomposition was applied on the matrix derived from continuous wavelet transform to extract extra features. The sequential forward …
Using Shared-Resource Capacity For Robust Control Of Failure-Prone Manufacturing Systems, Shengyong Wang, Song Chew, M. Lawley
Using Shared-Resource Capacity For Robust Control Of Failure-Prone Manufacturing Systems, Shengyong Wang, Song Chew, M. Lawley
Dr. Shengyong Wang
Deadlock-free resource allocation has been an active area of research in flexible manufacturing. Most researchers have assumed that allocated resources do not fail, and thus, little research has addressed the discrete-event supervision of manufacturing systems that are subject to resource failure. In our previous work, we developed supervisory controllers to ensure robust deadlock-free operation for systems with unreliable resources. These controllers guarantee that parts requiring failed resources do not block the production of parts that are not requiring failed resources. This previous work assumes that parts requiring failed resources can be advanced into failure-dependent (FD) buffer space (buffer space exclusively …
A Simulation-Based Approach For Dock Allocation In A Food Distribution Center, Balagopal Gopakumar, Suvarna Sundaram, Shengyong Wang
A Simulation-Based Approach For Dock Allocation In A Food Distribution Center, Balagopal Gopakumar, Suvarna Sundaram, Shengyong Wang
Dr. Shengyong Wang
This research endeavor focused on the warehouse receiving process at a large food distribution center, which comprises of trucks with goods reaching the destination warehouse, unloading and finally putting away the contents to the specific aisles. Discrete event simulation was used to model the current system’s functioning and to identify operational inefficiencies which were quantified through a detailed value stream mapping exercise. Inspired by ‘lean’ philosophy, a dock allocation algorithm was designed to take into account the relationship between the dock location and the destination aisle to ‘optimally’ assign the trucks to the docks. After validating the baseline, new scenarios …
What Drives Patient Satisfaction: A Rough Set Approach, Yuerong Chen, Shengyong Wang, Chien-Chung Chan, Tejas Gandhi
What Drives Patient Satisfaction: A Rough Set Approach, Yuerong Chen, Shengyong Wang, Chien-Chung Chan, Tejas Gandhi
Dr. Shengyong Wang
This paper considers an inventory system that consists of a supplier, a retailer, and customers. The retailer adopts a continuous-review inventory policy, applies dynamic pricing and is subject to supply disruptions. Customer demands are price-sensitive. The inventory system is simulated and the impacts of supply disruptions and dynamic pricing are investigated. The experimental results provide managerial suggestions to the retailer. For instance, the retailer should pay more attention to supply disruption duration than disruption frequency. Besides, the retailer ought to consider the scenarios of supply disruptions and customer demand variation before making a dynamic pricing strategy.
Matrix Decomposition Based Feature Extraction For Murmur Classification, Yuerong Chen, Shengyong Wang, Chia-Hsuan Shen, Fred Choy
Matrix Decomposition Based Feature Extraction For Murmur Classification, Yuerong Chen, Shengyong Wang, Chia-Hsuan Shen, Fred Choy
Dr. Shengyong Wang
Heart murmurs often indicate heart valvular disorders. However, not all heart murmurs are organic. For example, musical murmurs detected in children are mostly innocent. Because of the challenges of mastering auscultation skills and reducing healthcare expenses, this study aims to discover new features for distinguishing innocent murmurs from organic murmurs, with the ultimate objective of designing an intelligent diagnostic system that could be used at home. Phonocardiographic signals that were recorded in an auscultation training CD were used for analysis. Instead of the discrete wavelet transform that has been used often in previous work, a continuous wavelet transform was applied …
Process Completing Sequences For Resource Allocation Systems With Synchronization, Song Foh Chew, Shengyong Wang
Process Completing Sequences For Resource Allocation Systems With Synchronization, Song Foh Chew, Shengyong Wang
Dr. Shengyong Wang
This paper considers the problem of establishing live resource allocation in workflows with synchronization stages. Establishing live resource allocation in this class of systems is challenging since deciding whether a given level of resource capacities is sufficient to complete a single process is NP-complete. In this paper, we develop two necessary conditions and one sufficient condition that provide quickly computable tests for the existence of process completing sequences. The necessary conditions are based on the sequence of completions of � subprocesses that merge together at a synchronization. Although the worst case complexity is O(2�), we expect the number of subprocesses …
A Modular Approach To Computer-Aided Auscultation: Analysis And Parametric Characterization Of Murmur Acoustic Qualities, Chia-Hsuan Shen, Fred Choy, Yuerong Chen, Shengyong Wang
A Modular Approach To Computer-Aided Auscultation: Analysis And Parametric Characterization Of Murmur Acoustic Qualities, Chia-Hsuan Shen, Fred Choy, Yuerong Chen, Shengyong Wang
Dr. Shengyong Wang
In the present work, a modularized approach to computer-aided auscultation based on the traditional cardiac auscultation of murmur is proposed. Under such an approach, the present paper concerns the task of evaluating murmur acoustic quality character. The murmurs were analyzed in their time-series representation, frequency representation as well as time-frequency representation, allowing extraction of interpretable features based on their signal structural and spectral characters. The features were evaluated using scatter plots, receiver operating characteristic curves (ROC), and numerical experiments using a KNN classifier. The possible physiological and hemodynamical associations with the feature set are made. The implication and advantage of …
Reengineering The Cardiac Catheterization Lab Processes: A Lean Approach, Venkatesh Raghavan, Vikram Venkatadri, Varum Kesavakumaran, Shengyong Wang, Mohammad Khasawneh, Krisnaswami Srihari
Reengineering The Cardiac Catheterization Lab Processes: A Lean Approach, Venkatesh Raghavan, Vikram Venkatadri, Varum Kesavakumaran, Shengyong Wang, Mohammad Khasawneh, Krisnaswami Srihari
Dr. Shengyong Wang
This paper presents a cross-functional effort in a US community hospital for an overall process improvement in its Cardiac Catheterization Lab (CCL). One of the key system performance metrics identified was the patient turnaround time. The objective of this study was to identify the sources of delays in the system that lead to prolonged patient turnaround time using a structured lean approach. A set of qualitative recommendations were proposed and implemented. Quantification of some of these recommendations and certain additional ‘what-if’ scenarios were evaluated using Discrete Event Simulation (DES). The simulation results showed that significant reduction in patient turnaround time …